[英]Allocate the memory of struct more efficiently in C++
I'm trying the construct a struct in C++ as below: 我正在尝试使用C ++构造一个struct,如下所示:
struct kmer_value {
uint32_t count : 32;
uint32_t path_length : 32;
uint8_t acgt_prev : 4;
uint8_t acgt_next : 4;
}
The struct currently takes the memory of 12 bytes, but I want to reduce the size to 9 bytes. 结构当前占用12个字节的内存,但我想将大小减小到9个字节。 Is there any way to realize it?
有没有办法实现它?
Thank you. 谢谢。
There's no portable solution. 没有便携式解决方案。 For GCC that would be
对于海湾合作委员会而言
struct __attribute__((packed)) kmer_value {
uint32_t count : 32;
uint32_t path_length : 32;
uint8_t acgt_prev : 4;
uint8_t acgt_next : 4;
};
In MSVC #pragma pack
can achieve the same effect. 在MSVC
#pragma pack
可以达到同样的效果。
Consult your compiler's documentation. 请参阅编译器的文档。
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